Quick Answer
The correct answer is a compilation error. This occurs because the Java compiler strictly requires that the condition inside an `if` statement evaluates to a boolean value, but the expression `x = 5` uses the assignment operator, which assigns the integer 5 to `x` and then returns that integer value. Since an `int` cannot be automatically converted to a `boolean` in Java, the compiler rejects the code at compile time. On the Oracle Java Foundations 1Z0-811 exam, this question tests your understanding of the fundamental difference between the assignment operator `=` and the equality operator `==`, a classic trap that catches many developers transitioning from languages like C or C++. A reliable memory tip is to read `if (x = 5)` aloud as “if x gets 5” rather than “if x equals 5”—if the statement doesn’t sound like a true-or-false question, it’s likely a compilation error in Java.
This 1Z0-811 practice question tests your understanding of java basics and syntax. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer writes: if (x = 5) { System.out.println("x is 5"); } What is the result?
Compilation error
Assignment is not boolean and cannot be used in if condition.
Prints "x is 5" if x equals 5
Why wrong: Code does not compile.
No output
Why wrong: Code does not compile.
Prints "x is 5" always
Why wrong: Code does not compile.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Compilation error
In Java, the assignment operator `=` is used for assignment, not comparison. The expression `x = 5` assigns the value 5 to variable `x` and returns the assigned value (5). Since the condition in an `if` statement must be a boolean expression, and `int` cannot be implicitly converted to `boolean`, the compiler throws a compilation error. This is a fundamental syntax rule in Java, unlike in C/C++ where such an assignment would be allowed as a truthy check.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Compilation error
Why this is correct
Assignment is not boolean and cannot be used in if condition.
Related concept
Read the scenario before looking for a memorised answer.
Prints "x is 5" if x equals 5
Why it's wrong here
Code does not compile.
No output
Why it's wrong here
Code does not compile.
Prints "x is 5" always
Why it's wrong here
Code does not compile.
Common exam traps
Oracle often tests the distinction between assignment (`=`) and comparison (`==`) in conditional statements, exploiting the common misconception that Java behaves like C/C++ where an assignment expression can be used as a boolean condition.
Detailed technical explanation
Java's type system is strict: the condition in an `if` statement must evaluate to a `boolean` (true or false). The assignment operator `=` returns the assigned value (an `int` in this case), which cannot be automatically converted to `boolean`. This contrasts with languages like C or JavaScript, where non-zero values are truthy. In real-world scenarios, this common typo (using `=` instead of `==`) can be caught by modern IDEs and linters, but the Java compiler itself enforces this rule at compile time.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 1Z0-811 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Java Basics and Syntax — This question tests Java Basics and Syntax — Read the scenario before looking for a memorised answer..
The correct answer is: Compilation error — In Java, the assignment operator `=` is used for assignment, not comparison. The expression `x = 5` assigns the value 5 to variable `x` and returns the assigned value (5). Since the condition in an `if` statement must be a boolean expression, and `int` cannot be implicitly converted to `boolean`, the compiler throws a compilation error. This is a fundamental syntax rule in Java, unlike in C/C++ where such an assignment would be allowed as a truthy check.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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